Heke's case differed from that of Armstrong Renata, who was give an seven-year sentence for the single-punch death of teenager Cole Miller in 2016, Mr Allen said.

Mr Miller was struck from behind by Renata while on a night out in the Fortitude Valley nightclub district.

"In a (unlawful striking causing death) case, it would be less serious if the death was neither foreseen nor reasonably foreseeable, as opposed to a case where the death was foreseeable," Mr Allen said.

"In this case, that feature is available and I can say that because of the manslaughter acquittal."

Mr Allen also questioned if the one-punch laws were designed to target incidents where parties agreed to enter into a fight.

"Far from being drunk or out looking for trouble, he was most likely fatigued after a punishing working schedule," Mr Allen said.

"Both he and the victim chose to confront each other at the side of the highway. The victim was at least verbally aggressive in the confrontation."